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CCSS.Math.Content.3.MD.C.7

Area of Rectangles by Tiling

A unit square is a square having each side of length 1 unit. The area of a unit square is 1 square unit.

For example, consider the following rectangle made of unit squares.

1 a

Let's find the area of this rectangle.

To find out the area, we need to count the total number of unit squares.

 

1 b

 

There are 15 unit squares inside the rectangle.
 

So, the area of the given rectangle is 15 square units.





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Help

The correct answer is

Remember :

The smallest number is the one that comes first while counting.

Solution :

To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.

21,27,23

21 is the smallest number.